Granted Patent
Utility
US 4,501,592 · App. 06/521,904
Anthraquinone dyes, process for their preparation, and use thereof
Inventors:
Jean-Marie Adam, Peter Bloch
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Aug 10, 1983
Inventors
Jean-Marie Adam
Peter Bloch
Assignee (at issue)
Ciba-Geigy
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.